Is it possible to catch an exception raised in a key bindings handler? Not inside the application, but it should be possible outside the application. Consider the following MVE:
import asyncio
from prompt_toolkit import PromptSession
from prompt_toolkit.key_binding import KeyBindings
async def main():
bindings = KeyBindings()
@bindings.add("c-t")
def handler(_):
raise Exception("Hello!")
try:
await PromptSession().prompt_async("> ", key_bindings=bindings)
except Exception as ex:
print(f"Caught exception: {ex}")
if __name__ == "__main__":
asyncio.run(main())
Running that program and hitting CTRL+T at the prompt should raise an exception in the handler function, and since keyboard processing happen inside the prompt_async application the exception should be propagated to the caller of prompt_async(), I think.
But I get the following error:
Unhandled exception in event loop:
File "/usr/lib/python3.11/asyncio/events.py", line 80, in _run
self._context.run(self._callback, *self._args)
File "/usr/lib/python3.11/site-packages/prompt_toolkit/input/vt100.py", line 162, in callback_wrapper
callback()
File "/usr/lib/python3.11/site-packages/prompt_toolkit/application/application.py", line 714, in read_from_input_in_context
context.copy().run(read_from_input)
File "/usr/lib/python3.11/site-packages/prompt_toolkit/application/application.py", line 694, in read_from_input
self.key_processor.process_keys()
File "/usr/lib/python3.11/site-packages/prompt_toolkit/key_binding/key_processor.py", line 272, in process_keys
self._process_coroutine.send(key_press)
File "/usr/lib/python3.11/site-packages/prompt_toolkit/key_binding/key_processor.py", line 187, in _process
self._call_handler(matches[-1], key_sequence=buffer[:])
File "/usr/lib/python3.11/site-packages/prompt_toolkit/key_binding/key_processor.py", line 322, in _call_handler
handler.call(event)
File "/usr/lib/python3.11/site-packages/prompt_toolkit/key_binding/key_bindings.py", line 126, in call
result = self.handler(event)
^^^^^^^^^^^^^^^^^^^
File "$HOME/ptktest.py", line 12, in handler
raise Exception("Hello!")
Exception Hello!
Press ENTER to continue...
Is it possible to catch an exception raised in a key bindings handler? Not inside the application, but it should be possible outside the application. Consider the following MVE:
Running that program and hitting CTRL+T at the prompt should raise an exception in the
handlerfunction, and since keyboard processing happen inside theprompt_asyncapplication the exception should be propagated to the caller ofprompt_async(), I think.But I get the following error:
I expect it to just print:
And then exit.
Is this possible in any way?
Best regards, Tage